// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_WM_CORE_TRANSIENT_WINDOW_OBSERVER_H_
#define UI_WM_CORE_TRANSIENT_WINDOW_OBSERVER_H_

#include "ui/wm/wm_export.h"

namespace aura {
class Window;
}

namespace wm {

class WM_EXPORT TransientWindowObserver {
public:
    // Called when a transient child is added to |window|.
    virtual void OnTransientChildAdded(aura::Window* window,
        aura::Window* transient)
        = 0;

    // Called when a transient child is removed from |window|.
    virtual void OnTransientChildRemoved(aura::Window* window,
        aura::Window* transient)
        = 0;

protected:
    virtual ~TransientWindowObserver() { }
};

} // namespace wm

#endif // UI_WM_CORE_TRANSIENT_WINDOW_OBSERVER_H_
